On Tue, Sep 20, 2016 at 3:59 PM, Chris Angelico <ros...@gmail.com> wrote:
> On Wed, Sep 21, 2016 at 8:50 AM, Irmen de Jong <irmen.nos...@xs4all.nl> > wrote: > >> Dunno if it's the cause or not, but you're running a 32-bit PyPy on a > >> 64-bit Windows. I could well imagine that that has some odd > >> significance. > >> > >> ChrisA > > > > > > Perhaps. Though I can't really imagine what's going on there then. The > one on Linux is > > 32 bits as well and it's also much faster... > > Unfortunately there's no 64 bits pypy expected for windows, so I can't > test that > > Yeah, but the Linux one is running in a 32-bit OS. I don't know how > the "32-bit on 64-bit" subsystem of Windows works and how fast it is; > it could be that the thunking defeats some optimizations relating to > floating-point. Who knows. Hard to test. > WoW64 shouldn't have any measurable speed decrease. I've run plenty of 32-bit games on a 64-bit Windows (many games are still 32-bit only), and they always perform fine, regardless of whether they are CPU or GPU bound based off the profiling I've done. I think most of the cost is paid in the context switches. Regarding the performance decrease, it may be worthwhile to push the report to a PyPy specific forum - a PyPy developer will probably see it here, but you may get a faster response on a forum specific to PyPy. -- https://mail.python.org/mailman/listinfo/python-list
